Term
| If the evaporator (TD) is high what will the suction pressure be? |
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Definition
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Term
| how many Btu's per ton for coolers |
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Definition
| 8000 Btu's per ton per hour |
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Term
Gaskets provide a seal between the door and the cabinet
What are the 2 types of gaskets? |
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Definition
Magnetic
and baloon style |
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Term
| What is the purpose of the case or stile heater? |
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Definition
| To prevent condensationor moisture from forming around the front flange area |
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Term
| If the condenser (TD) is high what will your head pressure be? |
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Definition
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Term
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Definition
American society of heating,refridgeration and air conditioning
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Term
| What is the purpose of a mullion heater? |
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Definition
| to prevent condensation from forming along the rail |
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Term
| what is the purpose of the power saver switch? |
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Definition
| to save energy by turning the stile and mullion heaters off durring low humidity conditions |
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Term
what are the manufacturers classifications for:
high temp
medium temp
low temp |
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Definition
high temp +45 F
medium temp +20 F
low temp -10 F
extra low temp bloow -10 F
ultra low temp below -40 F |
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Term
| what will happen to the density of a saturated vapor when heat is added? |
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Definition
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Term
| as density decreases the volume? |
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Definition
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Term
| heat removed from a saturated vapor causes the density to |
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Definition
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Term
| air is a mixture of what 2 gases |
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Definition
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Term
| is water vapor lighter or heavier than dry air? |
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Definition
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Term
which is more dense
dry air alone or
a mixture of dry air and water vapor? |
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Definition
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Term
| what are the air properties that a psychometric chart will determine? |
|
Definition
dry bulb temp
wet bulb temp
and relative humidity |
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Term
| what is relative humidity |
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Definition
| The percentage of moisture in the air at a given temperature |
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Term
| if the evap (TD) goes up what will happen to the Relative humidity |
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Definition
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Term
relative humidity and evap (TD) are inversely proportional
true/false |
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Definition
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Term
| why is relative humidity important in medium temp applications? |
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Definition
to maximize product life
to prevent product dehydration |
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|
Term
| how many Btu's per ton for freezers |
|
Definition
| 4000 Btu's per ton per hour |
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